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Pertex 20d 100% Nylon R/S 1.03oz/yd

The Atom’s ultra light design and high quality down have given it cult status among alpinists as a bivvy bag on extreme climbs. A great bag for warm-weather nights on casual summer road trips, the full update — with changes like curved baffles that reduce shifting down and a fold-down second zipper for ventilation — makes this bag even more comfortable than before.